"""
Kalender Widget fuer das Lehrer-Dashboard.

Zeigt anstehende Termine und Events.
"""


class KalenderWidget:
    widget_id = 'kalender'
    widget_name = 'Termine'
    widget_icon = '📆'  # Calendar
    widget_color = '#ec4899'  # Pink
    default_width = 'half'
    has_settings = True

    @staticmethod
    def get_css() -> str:
        return """
/* ===== Kalender Widget Styles ===== */
.widget-kalender {
    background: var(--bp-surface, #1e293b);
    border: 1px solid var(--bp-border, #475569);
    border-radius: 12px;
    padding: 16px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.widget-kalender .widget-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--bp-border-subtle, rgba(255,255,255,0.1));
}

.widget-kalender .widget-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--bp-text, #e5e7eb);
}

.widget-kalender .widget-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(236, 72, 153, 0.15);
    color: #ec4899;
    border-radius: 8px;
    font-size: 14px;
}

.widget-kalender .kalender-list {
    flex: 1;
    overflow-y: auto;
}

.widget-kalender .termin-item {
    display: flex;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--bp-border-subtle, rgba(255,255,255,0.05));
}

.widget-kalender .termin-item:last-child {
    border-bottom: none;
}

.widget-kalender .termin-date {
    width: 48px;
    text-align: center;
    flex-shrink: 0;
}

.widget-kalender .termin-day {
    font-size: 20px;
    font-weight: 700;
    color: var(--bp-text, #e5e7eb);
    line-height: 1;
}

.widget-kalender .termin-month {
    font-size: 11px;
    color: var(--bp-text-muted, #9ca3af);
    text-transform: uppercase;
}

.widget-kalender .termin-content {
    flex: 1;
    min-width: 0;
}

.widget-kalender .termin-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--bp-text, #e5e7eb);
    margin-bottom: 4px;
}

.widget-kalender .termin-meta {
    font-size: 11px;
    color: var(--bp-text-muted, #9ca3af);
    display: flex;
    gap: 8px;
}

.widget-kalender .termin-type {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 10px;
}

.widget-kalender .termin-type.konferenz {
    background: rgba(139, 92, 246, 0.15);
    color: #8b5cf6;
}

.widget-kalender .termin-type.elterngespraech {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.widget-kalender .termin-type.fortbildung {
    background: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
}

.widget-kalender .termin-type.pruefung {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.widget-kalender .kalender-empty {
    text-align: center;
    padding: 24px;
    color: var(--bp-text-muted, #9ca3af);
    font-size: 13px;
}

.widget-kalender .kalender-empty-icon {
    font-size: 32px;
    margin-bottom: 8px;
    opacity: 0.5;
}

.widget-kalender .kalender-footer {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--bp-border-subtle, rgba(255,255,255,0.1));
}

.widget-kalender .kalender-add-btn {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px dashed var(--bp-border, #475569);
    border-radius: 8px;
    color: var(--bp-text-muted, #9ca3af);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.widget-kalender .kalender-add-btn:hover {
    border-color: #ec4899;
    color: #ec4899;
}
"""

    @staticmethod
    def get_html() -> str:
        return """
<div class="widget-kalender" data-widget-id="kalender">
    <div class="widget-header">
        <div class="widget-title">
            <span class="widget-icon">&#128198;</span>
            <span>Anstehende Termine</span>
        </div>
        <button class="widget-settings-btn" onclick="openWidgetSettings('kalender')" title="Einstellungen">&#9881;</button>
    </div>
    <div class="kalender-list" id="kalender-list">
        <!-- Wird dynamisch gefuellt -->
    </div>
    <div class="kalender-footer">
        <button class="kalender-add-btn" onclick="addTermin()">+ Termin hinzufuegen</button>
    </div>
</div>
"""

    @staticmethod
    def get_js() -> str:
        return """
// ===== Kalender Widget JavaScript =====
const KALENDER_STORAGE_KEY = 'bp-lehrer-kalender';

function getDefaultTermine() {
    const today = new Date();
    return [
        {
            id: 1,
            titel: 'Fachkonferenz Deutsch',
            datum: new Date(today.getTime() + 2 * 24 * 60 * 60 * 1000).toISOString(),
            zeit: '14:00 - 16:00',
            ort: 'Konferenzraum A',
            typ: 'konferenz'
        },
        {
            id: 2,
            titel: 'Elterngespraech Mueller',
            datum: new Date(today.getTime() + 4 * 24 * 60 * 60 * 1000).toISOString(),
            zeit: '17:30 - 18:00',
            ort: 'Klassenraum 204',
            typ: 'elterngespraech'
        },
        {
            id: 3,
            titel: 'Fortbildung: Digitale Medien',
            datum: new Date(today.getTime() + 7 * 24 * 60 * 60 * 1000).toISOString(),
            zeit: '09:00 - 15:00',
            ort: 'Online',
            typ: 'fortbildung'
        }
    ];
}

function loadTermine() {
    const stored = localStorage.getItem(KALENDER_STORAGE_KEY);
    return stored ? JSON.parse(stored) : getDefaultTermine();
}

function saveTermine(termine) {
    localStorage.setItem(KALENDER_STORAGE_KEY, JSON.stringify(termine));
}

function formatTerminDate(dateStr) {
    const date = new Date(dateStr);
    return {
        day: date.getDate(),
        month: date.toLocaleDateString('de-DE', { month: 'short' })
    };
}

function getTypLabel(typ) {
    const labels = {
        konferenz: '&#128101; Konferenz',
        elterngespraech: '&#128106; Eltern',
        fortbildung: '&#128218; Fortbildung',
        pruefung: '&#128221; Pruefung'
    };
    return labels[typ] || typ;
}

function renderKalender() {
    const list = document.getElementById('kalender-list');
    if (!list) return;

    let termine = loadTermine();

    // Sort by date
    termine.sort((a, b) => new Date(a.datum) - new Date(b.datum));

    // Filter only future events
    const now = new Date();
    termine = termine.filter(t => new Date(t.datum) >= now);

    if (termine.length === 0) {
        list.innerHTML = `
            <div class="kalender-empty">
                <div class="kalender-empty-icon">&#128198;</div>
                <div>Keine anstehenden Termine</div>
            </div>
        `;
        return;
    }

    list.innerHTML = termine.slice(0, 4).map(termin => {
        const dateInfo = formatTerminDate(termin.datum);
        return `
            <div class="termin-item">
                <div class="termin-date">
                    <div class="termin-day">${dateInfo.day}</div>
                    <div class="termin-month">${dateInfo.month}</div>
                </div>
                <div class="termin-content">
                    <div class="termin-title">${termin.titel}</div>
                    <div class="termin-meta">
                        <span class="termin-type ${termin.typ}">${getTypLabel(termin.typ)}</span>
                        <span>&#128337; ${termin.zeit}</span>
                    </div>
                </div>
            </div>
        `;
    }).join('');
}

function addTermin() {
    alert('Termin-Editor wird in einer zukuenftigen Version verfuegbar sein.');
}

function initKalenderWidget() {
    renderKalender();
}
"""